Reading-Notes

Class 11: Understanding the JavaScript Call Stack

• Understanding the JavaScript Call Stack

• JavaScript error messages

---

Understanding the JavaScript Call Stack

• What is a ‘call’?

    - function invocation
  

• How many ‘calls’ can happen at once?

    - it's done one at a time.
  

• What does LIFO mean?

    -Last in first out
  

• Draw an example of a call stack and the functions that would need to be invoked to generate that call stack.

                                 _________________
                push  --------> |                 |  ---->  pop
                                |                 |<------Top
                                |_________________|
                                |                 |
                                |                 |
                                |_________________|
                                |                 |
                                |                 |
                                |_________________|
                                |                 |
                                |                 |
                                |_________________|
                                |                 | 
                                |                 |
                                |_________________|
  
  
  
  

• What causes a Stack Overflow?

        - when there is a recursive function without an exit point.
  

---

JavaScript error messages

• What is a ‘refrence error’?

        - is an error when an object that hasn't been introduced(initialized) or doesn't exist is being referenced.
  

• What is a ‘syntax error’?

        - error with how you are writing the code for the computer to understand. when something you wrote cannot be parsed.
  

• What is a ‘range error’?

        - setting an object to an invalid length 
  

• What is a ‘type error’?

        - when the type of data you are using is incompatible with how you are accessing it. 
  

• What is a breakpoint?

        - breakpoint is a certain place in a code where you will stop executing code.
  

• What does the word ‘debugger’ do in your code?

        - when your code hits a certain code block that isn't work it breaks you out of your code.